Scotting: when you vigorously claim an ability, explain how you are very good at said ability, take bets on ability, until it is time to prove the ability. This is the point where the person is to busy (or other excuses) to prove ability.

"I can kick a soccer ball further than anyone! Any bets? Great we will do it." On day of event can’t find a place to change his shoes. He is scotting out.